Change of name by deed poll

I changed my name by deed poll in the UK from Stuart Heaney to Kimberly Heaney and I want to update my name so that I can correctly attribute credits where I am credited as Kim Heaney (eg on The Last Sacrifice, the actual on-screen credit is to Kim Heaney and not Stuart Heaney), but I want to preserve the existing credits where I was credited under my birth name. I want to do this so that I can show my IMDb credits for future work without causing confusion and so that people will understand that Stuart Heaney is (was) also me.

Please let me know how I can do this. I have submitted a Name Correction request (no reference number for this yet, awaiting response).

Would it be better if I created a new account as Kim Heaney and then submitted a merge request to merge the names (while preserving existing credits)?

Finally, there is something else - there is another Stuart Heaney on IMDb whose credits are appearing as mine and vice versa. I am not the same Stuart Heaney who worked in the electrical department on The Corrs live or French and Saunders. How can these names be separated out? Usually there is a Stuart Heaney (I) and a Stuart Heaney (II), as I recall seeing. I don't know how to go about achieving this.

Thanks so much!

Best, Kim Heaney (FKA Stuart)